/*
 * Copyright 2010-2017 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.jetbrains.kotlin.sourceSections

import com.intellij.openapi.vfs.VirtualFile
import com.intellij.testFramework.LightVirtualFile
import org.jetbrains.kotlin.extensions.PreprocessedVirtualFileFactoryExtension

class FilteredSectionsVirtualFileExtension(val allowedSections: Set<String>?) : PreprocessedVirtualFileFactoryExtension {

    override fun isPassThrough(): Boolean = allowedSections == null || allowedSections.isEmpty()

    override fun createPreprocessedFile(file: VirtualFile?): VirtualFile? =
            when {
                file == null || allowedSections == null || allowedSections.isEmpty() -> file
                file is LightVirtualFile -> FilteredSectionsLightVirtualFile(file, allowedSections)
                else -> FilteredSectionsVirtualFile(file, allowedSections)
            }

    override fun createPreprocessedLightFile(file: LightVirtualFile?): LightVirtualFile? =
            when {
                file == null || allowedSections == null || allowedSections.isEmpty() -> file
                else -> FilteredSectionsLightVirtualFile(file, allowedSections)
            }
}